package com.sian.security.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.log4j.Logger;

public class SHA1 {
	private static Logger logger = org.apache.log4j.LogManager
			.getLogger(SHA1.class);

	public static String encode(String password) {
		MessageDigest md = null;
		try {
			md = MessageDigest.getInstance("SHA1");
		} catch (NoSuchAlgorithmException e) {
			logger.error(e.getMessage(), e);
			throw new RuntimeException(e.getMessage());
		}

		md.update(password.getBytes());
		String encrypedString = bytesToHex(md.digest());

		return encrypedString.toUpperCase();
	}

	protected static String bytesToHex(byte[] data) {
		StringBuffer buf = new StringBuffer();
		for (int i = 0; i < data.length; i++) {
			int halfbyte = (data[i] >>> 4) & 0x0F;
			int two_halfs = 0;
			do {
				if ((0 <= halfbyte) && (halfbyte <= 9))
					buf.append((char) ('0' + halfbyte));
				else
					buf.append((char) ('a' + (halfbyte - 10)));
				halfbyte = data[i] & 0x0F;
			} while (two_halfs++ < 1);
		}
		return buf.toString();
	}
}
